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Milky Way A Changing Galaxy

by SuperFunScience

What comes to your mind when you think of the Milky Way? Well,
the Milky Way is a galaxy among the billions of galaxies in the
universe. A galaxy refers to a cluster of billions of stars and
other heavenly bodies, including solar systems like ours.

Galaxies are classified on the basis of the arrangement of stars
- they form a shape like a spiral, disk, or sphere. The Milky Way
or the spiral galaxy is home to our own solar system, and the
planet Earth.

Our galaxy is called the Milky Way because of how it looks in
the night sky. As many famous astronomers have said, the Milky
Way looks like a stream of milky glowing stars.

The Milky Way is over 13.2 billion years old (about the age of
the universe itself) and consists of about 200 to 400 billion
stars. It has fascinated humans for many millennia, and will
continue to do so in the future because it possesses some
intriguing properties.

The Milky Way, as already mentioned, is an elegant spiral-armed
galaxy. A spiral galaxy consists of a ball-shaped body with
swirling arms surrounding it.

There is very dense celestial matter at the core of the galaxy,
and the stars become less crowded going down the arms. Our sun
and the solar system are located in one of the arms of our
galaxy.

The galaxy itself rotates around its center, completing one
rotation in just over 220 million years. Now that, my friends, is
a very long period when compared to the earth's rotation period
of 1 day.

New reports are coming out that suggest that the common
perception of the Milky Way's structure may not be correct.
However, mapping the Milky Way is very difficult, since we are
looking at it from the inside, with many stars blocking views of
the core of the galaxy.

New research shows that the galaxy is missing two of the four
arms that it was thought to have. This research has forced most
of our scientists to reconsider their perception about the
galaxy. Two research teams have carried out studies very
recently, giving some amazing results.

The first team used the Spitzer Space Telescope, which can see
through dust and successfully map the orbital speeds of the
stars. Two astonishing results that were brought out were that
two of the galaxy's four arms are in fact just small side
branches, and the central core is almost twice in size that was
previously believed!

The other team utilized such a powerful telescope that you may
even be able to read newspaper on the moon sitting here on earth.
There, the research shows that the galaxy is moving in a much
different manner than what we thought it to be.

Change in the pattern of the motion leads to a change in the
shape gradually, which scientists can use to backtrack and make
better guesses about the origins of the Universe. It also helps
us in having a better understanding of spiral galaxies like the
Milky Way and its nearest neighbor, the Andromeda galaxy, and
galactic motion in general.

However, it may be a long time before we can say that we have
substantial information about galaxies and the universe in
general, because there is so much more to learn!

Sara Jones was a fine student but science was a source of
frustration she didn't want her kids to suffer. She met <a
href="mailto:sfslinks@gmail.com">Rick and Amanda Birmingham</a>
and realized their grasp of everyday science was the secret to
making science fun. To learn more about the solution to science
stress visit <a href="http://www.SuperFunScience.com/form"
target="_blank">www.SuperFunScience.com/form</a>

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